How Do Buy-to-Lets Work? A Complete Guide

A buy-to-let mortgage is a type of loan used to buy a property specifically for the purpose of renting it out to tenants. 

The loan is typically secured against the property, which means that the lender has the right to repossess the property if the borrower fails to make payments. 

Buy-to-let mortgages require a larger deposit than a standard residential mortgage and often have higher interest rates. A minimum 25% deposit is required when purchasing a second or additional property (10% minimum on first time purchases).

Borrowers may also be required to demonstrate that they have sufficient income to cover rental payments and other associated costs.

Understanding Buy-to-Let Mortgages 

Tax implications

Buy-to-let mortgages are subject to a number of tax implications. The interest payments made on a buy-to-let mortgage are not tax deductible, unlike those on a residential mortgage. Additionally, the rental income received from the property is subject to income tax, and any capital gains made from the sale of the property are subject to capital gains tax. 

Landlords must also pay stamp duty on any property they purchase, and they are also liable to pay council tax on the property during void periods. They may also be required to pay a tax if the property is rented out for more than three months a year.

Finally, landlords must pay an annual tax on their rental income, known as ‘landlord’s tax’. This tax is based on the amount of rent received and is paid to HMRC.

Different Types of Buy-to-Let Mortgages



1. Fixed Rate Buy-to-Let Mortgages: With a fixed rate buy-to-let mortgage, your interest rate is fixed for a certain period of time, usually between two and five years. This means that you know exactly how much your payments will be each month during this period, making it easier to budget and plan your finances.

2. Variable Rate Buy-to-Let Mortgages: With a variable rate buy-to-let mortgage, your interest rate can move up or down in line with the Bank of England base rate. This means that your payments could go up or down depending on the Bank of England’s decisions. However, as your payments are not fixed, it can be more difficult to budget and plan your finances.

3. Tracker Buy-to-Let Mortgages: With a tracker buy-to-let mortgage, your interest rate is linked to the Bank of England base rate. This means that your payments will move in line with the Bank of England base rate, and you will know exactly how much your payments will be each month.

4. Capped Rate Buy-to-Let Mortgages: This is a type of buy-to-let mortgage that has an upper limit or cap on the interest rate that can be charged. This means that the borrower can enjoy the benefit of a lower rate of interest if the Bank of England base rate rises, but also be protected from excessive increases if it rises too high. 


How to Choose the Right Buy-to-Let Mortgage 

1. Calculate your budget: Before you start looking for a buy-to-let mortgage, you need to work out your budget. Consider the initial costs of purchasing the property, such as the deposit, legal fees, and survey costs. You should also factor in ongoing costs such as mortgage repayments, insurance, maintenance, and any tax liabilities.

2. Research lenders: Different buy-to-let lenders will offer different mortgage deals, so it’s worth shopping around. Look for lenders who specialise in buy-to-let mortgages, as they may be able to offer better deals than more general lenders.

3. Consider the term: Buy-to-let mortgages are typically offered on a short-term basis, meaning you may need to remortgage more regularly than with a residential mortgage. Consider how long you plan to hold the property and whether you’d be able to remortgage easily if necessary.

4. Check the fees: Buy-to-let mortgages often come with higher fees than residential mortgages, so make sure you’re aware of any upfront or ongoing costs associated with the mortgage.

5. Consider the rental income: Rental income is referred to as a properties Yield and is an important factor to consider when choosing a buy to let mortgage principally because it will determine how much of the monthly mortgage repayments you can cover with your income. Lenders will typically require you to prove your rental income before they will offer you a buy to let mortgage. This means that if you don’t have enough rental income to cover the payments, you may not be able to get the mortgage you need. Therefore, it is important to consider your rental income when choosing a buy to let mortgage in order to ensure that the payments are financially viable for you.

Benefits of Investing in Buy-to-Let Mortgages

Buy-to-let mortgages are an attractive option for investors looking to increase their income and potentially build long-term wealth. There are several key benefits associated with investing in buy-to-let mortgages, including: 

1. Potential for Higher Rental Yields: By investing in buy-to-let mortgages, investors can potentially earn higher rental yields than with traditional investments such as stocks and bonds. 

2. Tax Benefits: Many buy-to-let mortgage investors can take advantage of tax breaks such as mortgage interest relief for landlords. 

3. Long-term Capital Appreciation: The value of a buy-to-let property tends to increase over time, providing the opportunity for long-term capital growth. 

4. Low Maintenance: Unlike other investments such as stocks and bonds, properties require relatively low levels of investment of personal time once purchased.

5. Leverage: By using a buy-to-let mortgage, investors can leverage their money to purchase a property worth much more than the amount they initially invested. 

Risks of Buy-to-Let Mortgages


Buy-to-let mortgages carry a number of risks that investors should be aware of before committing to a purchase. These risks can be divided into two categories: financial and legal. 

Financial risks include: 

  • Lack of rental income: If the property fails to attract tenants, the mortgage payments cannot be paid.
  • Interest rate fluctuations: Changes in the Bank of England base rate can impact the cost of mortgage repayments unless this occurs within a fixed term. If you are considering investing in a buy-to-let property, it is important to do your research and speak to a qualified financial adviser or solicitor to ensure that you are making the right decision – as with any advice received, it is crucial that this is viewed in combination and with an in depth understanding of any other investment strategies you may already have. With careful planning and a well-managed investment, buy-to-lets can be a great way to generate an income and build a profitable portfolio.
  • Negative equity: If property prices fall, the investor may be left with a mortgage that is greater than the value of the property.

Legal risks include: 

  • Tenancy disputes: Disputes with tenants can be costly and time consuming to resolve.
  • Regulatory changes: Changes in government policy and regulation can affect the profitability of buy-to-let investments.
  • Deposit protection: Landlords are required to protect tenants’ deposits with a government approved scheme.

Final Thoughts

Ultimately, whether investing in a buy-to-let property is a good decision will depend on your own circumstances. It is important to consider your own financial situation, the location of the property and the potential costs associated with the investment. It is also important to understand the legal and tax implications of investing in this type of property.

If you are considering investing in a buy-to-let property, it is important to do your research and speak to a qualified financial adviser or solicitor to ensure that you are making the right decision. With careful planning and a well-managed investment, buy-to-lets can be a great way to generate an income and build a profitable portfolio.